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Replacing a Chassis Management Module

Use these instructions to install a CMM in the Flex System Enterprise Chassis. You can install a CMM while the chassis is powered on.

Before you install the CMM, complete the following steps:
  1. Read the installation instructions in the documentation that comes with the CMM.
  2. If you are installing a standby CMM, see ../com.lenovo.acc.cmm.doc/redundancy_prep_cmm.html.
  3. If you have not already done so, touch the static-protective package that contains the replacement CMM to an unpainted metal part of the chassis or any unpainted surface on any other grounded rack component for at least 2 seconds.
  4. Remove the CMM from its static-protective package.

To install a Chassis Management Module (CMM), complete the following steps.


Image showing the installation of the CMM into the chassis

  1. If a filler is installed in the CMM bay, remove it. Rotate the release handle on the filler down and slide it out of the bay.
  2. Press the CMM release latch down and rotate the CMM handle down until it stops.
  3. Align the CMM with the bay and slide it into the bay until it is seated.
  4. Close the handle (rotate the handle up) so that it locks in place.
    Note
    Make sure that the power-on LED on the CMM is lit. This indicates that the CMM is operating correctly. See CMM controls and indicators to locate the LED.

    When you install a CMM, if the chassis is not connected to a DHCP server on the network, it takes up to 3 minutes for the CMM to use the default (static) IP address.

    After failover, you might have to wait as long as 5 minutes to establish a network connection to the CMM. Some networks include switches, routers, and hubs that do not allow (or relay) an address resolution protocol (ARP) from the new CMM to update the network cached ARP table. Without this information relay, the new MAC address/IP association will not recognize the CMM. This condition will correct itself after the ARP table times out. To prevent this condition, reconfigure the network-routing setup tables to enable ARPs to be relayed from the CMM.

After you install the CMM, complete the following steps:
  1. Replace any components that you removed to gain access to the CMM bay.
  2. Connect all cables to the CMM.
  3. Depending on your system configuration, you might have to manually configure the CMM:
    • If this is a standby CMM and you followed the instructions in Preparing for CMM redundancy, no configuration is necessary.
      Note
      The standby CMM receives the configuration and status information automatically from the primary CMM. The transfer of information to the standby CMM can take up to 45 minutes after it is installed.
    • If this is the only CMM in the chassis, configure the new CMM:
      • If you saved the CMM configuration file before you replaced the CMM, you can apply the saved configuration file to the replacement CMM.
        • In the CMM web interface, saved configurations are applied in the Manage Configuration page (select Configuration from the Mgt Module Management menu). All fields and options are described in the CMM web interface online help.
        • In the CMM command-line interface (CLI), use the read command (see Lenovo Flex System Chassis Management Module read command for information about commands).
      • If you did not save the CMM configuration file before you replaced the CMM, see Configuring the CMM for information.